Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the surface of the clay platelets, which can be used as a dopant of PANI and play a ‘bridge’ role to combine PANI with clay. Adsorption experiments were carried out to study the effects of pH, contact time, Cr(VI) concentration, adsorbent dose and temperature. The adsorption of Cr(VI) on the PANI/MMT was highly pH dependent and the adsorption kinetics followed a pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity increased with the increase in temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent – liquid interface. The maximum adsorption capacity of the PANI/MMT composites for Cr(VI) was 308.6 mg/g at 25 °C. The excellent adsorption characteristic of exfoliated PANI/MMT composites will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.
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Research Article|
June 19 2014
Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite Available to Purchase
Jun Chen;
1School of Chemistry and Chemical Engineering, Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
E-mail: [email protected]
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Xiaoqin Hong;
Xiaoqin Hong
1School of Chemistry and Chemical Engineering, Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Yongteng Zhao;
Yongteng Zhao
1School of Chemistry and Chemical Engineering, Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Qianfeng Zhang
Qianfeng Zhang
1School of Chemistry and Chemical Engineering, Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Water Sci Technol (2014) 70 (4): 678–684.
Article history
Received:
January 09 2014
Accepted:
June 04 2014
Citation
Jun Chen, Xiaoqin Hong, Yongteng Zhao, Qianfeng Zhang; Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite. Water Sci Technol 1 August 2014; 70 (4): 678–684. doi: https://doi.org/10.2166/wst.2014.277
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